Notifications not getting shown and WLAN issues

I have two questions:
1.Suddenly my WhatsApp and Signal messenger notifications about new messages are not being shown. As i understand they run in the backround.
I checked the notifications and backround running settings. They all look good.
2. My phone is getting disconnected from my two home WLAN networks. It gets the connections back, especially if I open the WLAN settings. These networks were working before for a longer time period without any issue.
I tried to restart router,it didn’t solve the problem. Out of curiosity: what decides which WLAN network is the device connecting to, and is there a way to set up some priority?
The device is Xiaomi Mi A1

Regain your privacy! Adopt /e/ the unGoogled mobile OS and online servicesphone

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